【摘要】 采用高温固相法合成了系列Ce³⁺和Ce³⁺/Tb³⁺激活的具有磷灰石结构荧光粉Ba₁₀（PO₄）₆F₂。用X射线衍射（XRD）、扫描电镜（SEM）、激发和发射（PLE和PL）光谱对样品进行了表征分析。研究结果表明:所合成的荧光粉Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺具有氟磷灰石结构,样品微观呈现不规则形貌。荧光粉Ba10-x（PO4）6F2∶x Ce³⁺的相对发射强度随着x增加而增强,当x=0.09时,荧光强度达到最大。荧光粉Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺的激发光谱为240～330 nm的宽带,发射光谱呈现出Ce³⁺的5d→4f跃迁紫外光（335和358 nm）发射和Tb³⁺的4f→4f跃迁绿光（542 nm）发射。光谱特性表明,发光过程中存在Ce³⁺→Tb³⁺能量传递,能量传递效率可以达到60%。计算Ce³⁺和Tb³⁺的临界距离为0.79 nm,能量传递机理是偶极-偶极交互作用。此外,详细论述了Ce³⁺和Tb³⁺之间的能量传递和发光的过程。通过调节Tb³⁺的掺杂浓度,对荧光粉发光色坐标与Tb³⁺的掺杂浓度之间的关系也进行了研究,随着Tb³⁺的掺杂量从0增加0.52,荧光粉Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺的发射光谱色坐标可以从（0.149 4,0.045 1）蓝色区变化到（0.280 1,0.585 3）绿色区。更多还原

【Abstract】 A series of Ce³⁺-and Ce³⁺/Tb³⁺-activated Ba₁₀（PO₄）₆F₂phosphors with apatite structure have been synthesized via high temperature solid-state reaction. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, the photoluminenscence excitation（PLE） spectra and photoluminescence（PL） spectra were used to characterize samples. The results revealed that the fluorapatite structured Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺phosphor particles with irregular morphology have been obtained. The relative intensities of PL spectra of Ba10-x（PO4）6F2:x Ce³⁺phosphors increased with increasing x values, and reached the maximum at x=0.09. The as-prepared phosphors Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺phosphors exhibited broad excitation band ranging from 240 to 330 nm. The emission spectra of Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺phosphor showed the violet-emitting band centered at 335 and 358 nm and green light-emitting band centered at 542 nm, which originate from the 5d→4f transitions of Ce³⁺and 4f→4f transitions of Tb³⁺, respectively.The spectral characteristics showed that the energy transfer occurs from Ce³⁺to Tb³⁺in Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb3 +phosphors, and the energy transfer efficiency between Ce3 +and Tb3 +could reach up to 60%. The critical distance of Ce³⁺and Tb³⁺was calculated to be 0.79 nm, and the mechanism of energy transfer from Ce³⁺to Tb³⁺is dipole-dipole interaction. In addition, the energy transfer behavior and luminescence process were discussed in detail. By adjusting the concentration of Tb3 +, the relationship between chromatic coordinate and the doping concentration of Tb³⁺was studied. The Ba₁₀（PO₄）₆F₂∶Ce³⁺,Tb³⁺phosphors emission color could adjust from blue to green, and the chromatic coordinate tuned from（0.149 4, 0.045 1） to（0.280 1, 0.585 3） with increasing the concentration of Tb³⁺from 0 to 0.52.更多还原